[C++] c语言_Day27_07_28

• 一种变量，用来存放地址
  
• 指针大小固定，4个字节（32位）或8个字节（64位）
  
• 指针具有类型：决定了指针+-整数的步长，以及解引用的权限
  
• 指针可以进行运算
  

• 存放字符变量的地址
  
• 存放字符数组（字符串）
  

char arr1[] = "abc";
char arr2[] = "abc";
char p1 = "abc";
char p2 = "abc";
printf("%p\n", arr1);
printf("%p\n", arr2);
printf("%p\n", p1);
printf("%p\n", p2);

int main()
{
int arr1[] = { 1,2,3,4,5 };
int arr2[] = { 5,4,3,2,1 };
int arr3[] = { 1,3,5,7,9 };
int* parr[] = { arr1, arr2, arr3 };
for (int i = 0; i < 3; i++)
 {
    for (int j = 0; j &lt; 5; j++)
    {
      printf("%d ", parr[i][j]);
    }
    printf("\n");
  }

int main()
{
char arr[5];
char (*pa)[5] = &arr;
return 0;
}

int main()
{
int arr[10] = { 0 };
int(p)[10] = &arr;
printf("%p\n", arr);
printf("%p\n", p);
printf("%p\n", arr + 1);
printf("%p\n", p + 1);
return 0;
}

void Print1(int arr[][5], int row, int col)
{
for (int i = 0; i < row; i++)
 {
    for (int j = 0; j &lt; col; j++)
    {
      printf("%d ", arr[i][j]);
    }
    printf("\n");
  }

for (int k = 0; k < col; k++)
    {
      printf("%d ", (*(p + i))[k]);
    }
    printf("\n");
  }

int main()
{
int arr[10] = { 1,2,3,4,5,6,7,8,9,0 };
int* p = arr;
for (int i = 0; i < 10; i++)
 {
    printf("%d ", *(arr + i));
    printf("%d ", p[i]);
  }

arr == (arr + i) == (p + i) == p

int arr[10] // 10个元素的整形数组
int parr[10]   // 10个元素的整形指针数组
int (parr)[10] // 指向10个元素的整型数组的指针
int (*parr[10])[5]  // 10个元素的数组，每个元素为具有5个元素的整形数组指针